WARNING in kvm_arch_vcpu_ioctl_run

Status: upstream: reported C repro on 2023/03/23 13:22
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b000b7d21f93fc69de32@syzkaller.appspotmail.com
First crash: 1244d, last: 1d12h
Fix commit to backport (bisect log) :
tree: upstream
commit 8e6ed96cdd5001c55fccc80a17f651741c1ca7d2
Author: Li RongQing <lirongqing@baidu.com>
Date: Fri Jan 6 04:06:25 2023 +0000

  KVM: x86: fire timer when it is migrated and expired, and in oneshot mode

[report pending]
  
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in kvm_arch_vcpu_ioctl_run (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
Re: [v5.15] WARNING in kvm_arch_vcpu_ioctl_run 3 (3) 2023/08/28 15:23
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/05/18 linux-6.1.y (ToT) fa74641fb6b9 C [report] WARNING in kvm_arch_vcpu_ioctl_run
2023/05/18 upstream (ToT) 4d6d4c7f541d C Didn't crash
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in kvm_arch_vcpu_ioctl_run (5) kvm-x86 -1 syz, C error 343 1075d 1163d 23/29 fixed on 2023/10/12 12:47
upstream WARNING in kvm_arch_vcpu_ioctl_run (4) kvm-x86 -1 syz, C error 288 1168d 1251d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in kvm_arch_vcpu_ioctl_run (2) kvm-x86 -1 syz, C 61018 3123d 3212d 4/29 fixed on 2018/03/13 09:44
linux-6.6 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 syz, C done 2 340d 340d 2/2 fixed on 2025/10/19 16:15
upstream WARNING in kvm_arch_vcpu_ioctl_run (6) kvm-x86 -1 syz, C 117 316d 397d 29/29 fixed on 2025/10/29 21:02
upstream WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C 20284 3249d 3314d 3/29 fixed on 2017/09/26 01:38
linux-4.14 WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C inconclusive 71 1435d 2611d 0/1 upstream: reported C repro on 2019/06/25 23:07
upstream WARNING in kvm_arch_vcpu_ioctl_run (3) kvm-x86 -1 syz, C done error 16157 1272d 3066d 22/29 fixed on 2023/02/24 13:50
linux-4.19 WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C error 116 1344d 2619d 0/1 upstream: reported C repro on 2019/06/17 10:07
linux-5.15 WARNING in kvm_arch_vcpu_ioctl_run origin:lts-only -1 syz, C inconclusive 2063 16h34m 1228d 0/3 upstream: reported C repro on 2023/04/09 03:02
android-6-12 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 syz, C 51 296d 398d 0/1 premoderation: reported C repro on 2025/07/17 01:43
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/01/23 15:07 3h52m (2) fix candidate upstream OK (1) job log
2023/04/29 07:09 43m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4430 at arch/x86/kvm/x86.c:11275 kvm_arch_vcpu_ioctl_run+0x1d52/0x21f0 arch/x86/kvm/x86.c:11275
Modules linked in:
CPU: 0 PID: 4430 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1d52/0x21f0 arch/x86/kvm/x86.c:11275
Code: e8 a3 3e c3 00 e9 13 f0 ff ff 44 89 f1 80 e1 07 38 c1 0f 8c d1 e6 ff ff 4c 89 f7 e8 68 3e c3 00 e9 c4 e6 ff ff e8 9e 18 72 00 <0f> 0b e9 f9 fc ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 89 ec
RSP: 0018:ffffc90003547c98 EFLAGS: 00010293
RAX: ffffffff81100902 RBX: ffff88807a748000 RCX: ffff88802e531e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807a748000
RBP: ffff88807832d000 R08: dffffc0000000000 R09: 1ffffffff2162067
R10: dffffc0000000000 R11: fffffbfff2162068 R12: 1ffff920006a8fac
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900032437f0
FS:  00005555744ee500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000001d360000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x8f2/0xc10 virt/kvm/kvm_main.c:4122
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ec2b9de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc7d103a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2ec2e25fa0 RCX: 00007f2ec2b9de59
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f2ec2c33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ec2e25fac R14: 00007f2ec2e25fa0 R15: 00007f2ec2e25fa0
 </TASK>

Crashes (1600):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/15 21:11 linux-6.1.y 090666d3cc90 a4ed0f4f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/06 05:02 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/12/26 19:21 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/09/15 20:12 linux-6.1.y 3db754f56897 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/08/23 01:06 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/07/15 16:44 linux-6.1.y f2198ea7eb3e 03fcfc4b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/04/03 00:03 linux-6.1.y 8e60a714ba3b c799dfdd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/12/23 03:08 linux-6.1.y 29f02ec58a94 b4fbdbd4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/05/02 13:33 linux-6.1.y dcbc050cb0d3 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/01/21 20:27 linux-6.1.y 8fd7f4462453 9bd8dcda .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/03/23 16:10 linux-6.1.y e3a87a10f259 f94b4a29 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/08/18 01:00 linux-6.1.y 6c44e13dc284 74b106b6 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/07/30 14:08 linux-6.1.y d2a6dc4eaf6d 92476829 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/06/04 12:06 linux-6.1.y d2869ace6eeb a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/17 19:48 linux-6.1.y e4f7d8be268e 905244d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/17 02:10 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/16 19:13 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/16 16:28 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/14 10:12 linux-6.1.y e4f7d8be268e b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/14 01:02 linux-6.1.y e4f7d8be268e b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/13 08:00 linux-6.1.y e4f7d8be268e 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/11 19:45 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/11 05:08 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/11 02:28 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/11 02:28 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/09 20:50 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/09 14:29 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/08 14:24 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/08 12:27 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/05 09:53 linux-6.1.y fb28aa725e05 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/04 20:02 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/04 07:29 linux-6.1.y fb28aa725e05 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/02 22:19 linux-6.1.y fb28aa725e05 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/29 08:27 linux-6.1.y dc5c83b7f5f8 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/26 10:18 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/25 00:17 linux-6.1.y dc5c83b7f5f8 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/24 11:41 linux-6.1.y 090666d3cc90 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/23 09:51 linux-6.1.y 090666d3cc90 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/22 20:29 linux-6.1.y 090666d3cc90 4a865b71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/21 05:38 linux-6.1.y 090666d3cc90 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/19 13:12 linux-6.1.y 090666d3cc90 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/18 02:16 linux-6.1.y 090666d3cc90 8aaff637 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/18 00:01 linux-6.1.y 090666d3cc90 8aaff637 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/17 12:10 linux-6.1.y 090666d3cc90 7f27c57a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/15 15:48 linux-6.1.y 090666d3cc90 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/14 15:06 linux-6.1.y 090666d3cc90 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/14 14:35 linux-6.1.y 090666d3cc90 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 11:22 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 02:12 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/11 14:01 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/10 21:56 linux-6.1.y 090666d3cc90 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/09 04:40 linux-6.1.y 090666d3cc90 b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/07 21:44 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/05 20:32 linux-6.1.y 090666d3cc90 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/05 01:44 linux-6.1.y 090666d3cc90 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/04 23:30 linux-6.1.y 090666d3cc90 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/04 23:30 linux-6.1.y 090666d3cc90 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/04 07:05 linux-6.1.y fdb6fcb41cc7 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/04 02:29 linux-6.1.y fdb6fcb41cc7 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/03 19:45 linux-6.1.y fdb6fcb41cc7 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/03/23 13:22 linux-6.1.y e3a87a10f259 f94b4a29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
* Struck through repros no longer work on HEAD.